CVE-2026-74477

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74477", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.903Z", "datePublished": "2026-08-15T12:27:11.938Z", "dateUpdated": "2026-08-17T05:20:09.952Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:20:09.952Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuprobes: Fix NULL pointer dereference in hprobe_expire()\n\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000018\n Oops: 0002 [#1] SMP NOPTI\n RIP: 0010:hprobe_expire\n CR2: 0000000000000018\n Call Trace:\n uprobe_copy_process\n copy_process\n kernel_clone\n __x64_sys_clone\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n\nThis was found on real hosts on Meta fleet.\n\nI've got the impression that this is what is happening:\n\n CPU 1 CPU 2 (traced task)\n ----- -------------------\n hit uprobe, prepare_uretprobe():\n hprobe LEASED, refcount >= 1\n uprobe_unregister()\n put_uprobe(): refcount -> 0\n fork() -> dup_utask()\n hprobe_expire(hprobe, true)\n try_get_uprobe() -> NULL\n get_uprobe(NULL) <-- Oops\n\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/uprobes.c"], "versions": [{"version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb", "lessThan": "3bd35a5e272a1b7a3fb43acad9bdc599281b13fa", "status": "affected", "versionType": "git"}, {"version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb", "lessThan": "06c275a6c0a953ef1d763d11a6891fcc69ae2ac0", "status": "affected", "versionType": "git"}, {"version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb", "lessThan": "cc679d7a6303e84d769f2afcde1fc51c51f127cd", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/events/uprobes.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa"}, {"url": "https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0"}, {"url": "https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd"}], "title": "uprobes: Fix NULL pointer dereference in hprobe_expire()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/events/uprobes.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3bd35a5e272a1b7a3fb43acad9bdc599281b13fa", "status": "affected", "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb", "versionType": "git"}, {"lessThan": "06c275a6c0a953ef1d763d11a6891fcc69ae2ac0", "status": "affected", "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb", "versionType": "git"}, {"lessThan": "cc679d7a6303e84d769f2afcde1fc51c51f127cd", "status": "affected", "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/events/uprobes.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.13"}, {"lessThan": "6.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuprobes: Fix NULL pointer dereference in hprobe_expire()\n\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000018\n Oops: 0002 [#1] SMP NOPTI\n RIP: 0010:hprobe_expire\n CR2: 0000000000000018\n Call Trace:\n uprobe_copy_process\n copy_process\n kernel_clone\n __x64_sys_clone\n do_syscall_64\n entry_SYSCALL_64_after_hwframe\n\nThis was found on real hosts on Meta fleet.\n\nI've got the impression that this is what is happening:\n\n CPU 1 CPU 2 (traced task)\n ----- -------------------\n hit uprobe, prepare_uretprobe():\n hprobe LEASED, refcount >= 1\n uprobe_unregister()\n put_uprobe(): refcount -> 0\n fork() -> dup_utask()\n hprobe_expire(hprobe, true)\n try_get_uprobe() -> NULL\n get_uprobe(NULL) <-- Oops\n\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return."}], "id": "CVE-2026-74477", "lastModified": "2026-08-17T06:19:43.777", "metrics": {}, "published": "2026-08-15T13:17:52.497", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: uprobes: Fix NULL pointer dereference in hprobe_expire()", "id": "2517063", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517063"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nuprobes: Fix NULL pointer dereference in hprobe_expire()\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\nBUG: kernel NULL pointer dereference, address: 0000000000000018\nOops: 0002 [#1] SMP NOPTI\nRIP: 0010:hprobe_expire\nCR2: 0000000000000018\nCall Trace:\nuprobe_copy_process\ncopy_process\nkernel_clone\n__x64_sys_clone\ndo_syscall_64\nentry_SYSCALL_64_after_hwframe\nThis was found on real hosts on Meta fleet.\nI've got the impression that this is what is happening:\nCPU 1 CPU 2 (traced task)\n----- -------------------\nhit uprobe, prepare_uretprobe():\nhprobe LEASED, refcount >= 1\nuprobe_unregister()\nput_uprobe(): refcount -> 0\nfork() -> dup_utask()\nhprobe_expire(hprobe, true)\ntry_get_uprobe() -> NULL\nget_uprobe(NULL) <-- Oops\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return.", "A flaw was found in the Linux kernel's uprobes mechanism. A local attacker could exploit a race condition by forking a task with a pending uretprobe while another CPU unregisters the uprobe. This could lead to a NULL pointer dereference in the hprobe_expire() function, causing a kernel oops and resulting in a system crash, effectively a denial of service."], "name": "CVE-2026-74477", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74477\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74477\nhttps://lore.kernel.org/linux-cve-announce/2026081536-CVE-2026-74477-24c8@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd1a7567784e2b1f80258be04f57bcfa82c997eb,3bd35a5e272a1b7a3fb43acad9bdc599281b13fa)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd1a7567784e2b1f80258be04f57bcfa82c997eb,06c275a6c0a953ef1d763d11a6891fcc69ae2ac0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[dd1a7567784e2b1f80258be04f57bcfa82c997eb,cc679d7a6303e84d769f2afcde1fc51c51f127cd)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.44,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc6,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T15:45:06.745091+00:00", "updated": "2026-08-21T23:45:03.444945+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}